1 /*
2  * Copyright (C) 2016 Broadcom
3  *
4  * This program is free software; you can redistribute it and/or
5  * modify it under the terms of the GNU General Public License as
6  * published by the Free Software Foundation version 2.
7  *
8  * This program is distributed "as is" WITHOUT ANY WARRANTY of any
9  * kind, whether express or implied; without even the implied warranty
10  * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
11  * GNU General Public License for more details.
12  */
13 
14 #define pr_fmt(fmt)		KBUILD_MODNAME ": " fmt
15 
16 #include <linux/bcma/bcma.h>
17 #include <linux/brcmphy.h>
18 #include <linux/etherdevice.h>
19 #include <linux/of_address.h>
20 #include <linux/of_mdio.h>
21 #include <linux/of_net.h>
22 #include "bgmac.h"
23 
24 #define NICPM_PADRING_CFG		0x00000004
25 #define NICPM_IOMUX_CTRL		0x00000008
26 
27 #define NICPM_PADRING_CFG_INIT_VAL	0x74000000
28 #define NICPM_IOMUX_CTRL_INIT_VAL_AX	0x21880000
29 
30 #define NICPM_IOMUX_CTRL_INIT_VAL	0x3196e000
31 #define NICPM_IOMUX_CTRL_SPD_SHIFT	10
32 #define NICPM_IOMUX_CTRL_SPD_10M	0
33 #define NICPM_IOMUX_CTRL_SPD_100M	1
34 #define NICPM_IOMUX_CTRL_SPD_1000M	2
35 
36 static u32 platform_bgmac_read(struct bgmac *bgmac, u16 offset)
37 {
38 	return readl(bgmac->plat.base + offset);
39 }
40 
41 static void platform_bgmac_write(struct bgmac *bgmac, u16 offset, u32 value)
42 {
43 	writel(value, bgmac->plat.base + offset);
44 }
45 
46 static u32 platform_bgmac_idm_read(struct bgmac *bgmac, u16 offset)
47 {
48 	return readl(bgmac->plat.idm_base + offset);
49 }
50 
51 static void platform_bgmac_idm_write(struct bgmac *bgmac, u16 offset, u32 value)
52 {
53 	writel(value, bgmac->plat.idm_base + offset);
54 }
55 
56 static bool platform_bgmac_clk_enabled(struct bgmac *bgmac)
57 {
58 	if (!bgmac->plat.idm_base)
59 		return true;
60 
61 	if ((bgmac_idm_read(bgmac, BCMA_IOCTL) & BGMAC_CLK_EN) != BGMAC_CLK_EN)
62 		return false;
63 	if (bgmac_idm_read(bgmac, BCMA_RESET_CTL) & BCMA_RESET_CTL_RESET)
64 		return false;
65 	return true;
66 }
67 
68 static void platform_bgmac_clk_enable(struct bgmac *bgmac, u32 flags)
69 {
70 	u32 val;
71 
72 	if (!bgmac->plat.idm_base)
73 		return;
74 
75 	/* The Reset Control register only contains a single bit to show if the
76 	 * controller is currently in reset.  Do a sanity check here, just in
77 	 * case the bootloader happened to leave the device in reset.
78 	 */
79 	val = bgmac_idm_read(bgmac, BCMA_RESET_CTL);
80 	if (val) {
81 		bgmac_idm_write(bgmac, BCMA_RESET_CTL, 0);
82 		bgmac_idm_read(bgmac, BCMA_RESET_CTL);
83 		udelay(1);
84 	}
85 
86 	val = bgmac_idm_read(bgmac, BCMA_IOCTL);
87 	/* Some bits of BCMA_IOCTL set by HW/ATF and should not change */
88 	val |= flags & ~(BGMAC_AWCACHE | BGMAC_ARCACHE | BGMAC_AWUSER |
89 			 BGMAC_ARUSER);
90 	val |= BGMAC_CLK_EN;
91 	bgmac_idm_write(bgmac, BCMA_IOCTL, val);
92 	bgmac_idm_read(bgmac, BCMA_IOCTL);
93 	udelay(1);
94 }
95 
96 static void platform_bgmac_cco_ctl_maskset(struct bgmac *bgmac, u32 offset,
97 					   u32 mask, u32 set)
98 {
99 	/* This shouldn't be encountered */
100 	WARN_ON(1);
101 }
102 
103 static u32 platform_bgmac_get_bus_clock(struct bgmac *bgmac)
104 {
105 	/* This shouldn't be encountered */
106 	WARN_ON(1);
107 
108 	return 0;
109 }
110 
111 static void platform_bgmac_cmn_maskset32(struct bgmac *bgmac, u16 offset,
112 					 u32 mask, u32 set)
113 {
114 	/* This shouldn't be encountered */
115 	WARN_ON(1);
116 }
117 
118 static void bgmac_nicpm_speed_set(struct net_device *net_dev)
119 {
120 	struct bgmac *bgmac = netdev_priv(net_dev);
121 	u32 val;
122 
123 	if (!bgmac->plat.nicpm_base)
124 		return;
125 
126 	/* SET RGMII IO CONFIG */
127 	writel(NICPM_PADRING_CFG_INIT_VAL,
128 	       bgmac->plat.nicpm_base + NICPM_PADRING_CFG);
129 
130 	val = NICPM_IOMUX_CTRL_INIT_VAL;
131 	switch (bgmac->net_dev->phydev->speed) {
132 	default:
133 		netdev_err(net_dev, "Unsupported speed. Defaulting to 1000Mb\n");
134 		/* fall through */
135 	case SPEED_1000:
136 		val |= NICPM_IOMUX_CTRL_SPD_1000M << NICPM_IOMUX_CTRL_SPD_SHIFT;
137 		break;
138 	case SPEED_100:
139 		val |= NICPM_IOMUX_CTRL_SPD_100M << NICPM_IOMUX_CTRL_SPD_SHIFT;
140 		break;
141 	case SPEED_10:
142 		val |= NICPM_IOMUX_CTRL_SPD_10M << NICPM_IOMUX_CTRL_SPD_SHIFT;
143 		break;
144 	}
145 
146 	writel(val, bgmac->plat.nicpm_base + NICPM_IOMUX_CTRL);
147 
148 	bgmac_adjust_link(bgmac->net_dev);
149 }
150 
151 static int platform_phy_connect(struct bgmac *bgmac)
152 {
153 	struct phy_device *phy_dev;
154 
155 	if (bgmac->plat.nicpm_base)
156 		phy_dev = of_phy_get_and_connect(bgmac->net_dev,
157 						 bgmac->dev->of_node,
158 						 bgmac_nicpm_speed_set);
159 	else
160 		phy_dev = of_phy_get_and_connect(bgmac->net_dev,
161 						 bgmac->dev->of_node,
162 						 bgmac_adjust_link);
163 	if (!phy_dev) {
164 		dev_err(bgmac->dev, "PHY connection failed\n");
165 		return -ENODEV;
166 	}
167 
168 	return 0;
169 }
170 
171 static int bgmac_probe(struct platform_device *pdev)
172 {
173 	struct device_node *np = pdev->dev.of_node;
174 	struct bgmac *bgmac;
175 	struct resource *regs;
176 	const u8 *mac_addr;
177 
178 	bgmac = bgmac_alloc(&pdev->dev);
179 	if (!bgmac)
180 		return -ENOMEM;
181 
182 	platform_set_drvdata(pdev, bgmac);
183 
184 	/* Set the features of the 4707 family */
185 	bgmac->feature_flags |= BGMAC_FEAT_CLKCTLST;
186 	bgmac->feature_flags |= BGMAC_FEAT_NO_RESET;
187 	bgmac->feature_flags |= BGMAC_FEAT_CMDCFG_SR_REV4;
188 	bgmac->feature_flags |= BGMAC_FEAT_TX_MASK_SETUP;
189 	bgmac->feature_flags |= BGMAC_FEAT_RX_MASK_SETUP;
190 	bgmac->feature_flags |= BGMAC_FEAT_IDM_MASK;
191 
192 	bgmac->dev = &pdev->dev;
193 	bgmac->dma_dev = &pdev->dev;
194 
195 	mac_addr = of_get_mac_address(np);
196 	if (!IS_ERR(mac_addr))
197 		ether_addr_copy(bgmac->net_dev->dev_addr, mac_addr);
198 	else
199 		dev_warn(&pdev->dev, "MAC address not present in device tree\n");
200 
201 	bgmac->irq = platform_get_irq(pdev, 0);
202 	if (bgmac->irq < 0)
203 		return bgmac->irq;
204 
205 	regs = platform_get_resource_byname(pdev, IORESOURCE_MEM, "amac_base");
206 	if (!regs) {
207 		dev_err(&pdev->dev, "Unable to obtain base resource\n");
208 		return -EINVAL;
209 	}
210 
211 	bgmac->plat.base = devm_ioremap_resource(&pdev->dev, regs);
212 	if (IS_ERR(bgmac->plat.base))
213 		return PTR_ERR(bgmac->plat.base);
214 
215 	regs = platform_get_resource_byname(pdev, IORESOURCE_MEM, "idm_base");
216 	if (regs) {
217 		bgmac->plat.idm_base = devm_ioremap_resource(&pdev->dev, regs);
218 		if (IS_ERR(bgmac->plat.idm_base))
219 			return PTR_ERR(bgmac->plat.idm_base);
220 		bgmac->feature_flags &= ~BGMAC_FEAT_IDM_MASK;
221 	}
222 
223 	regs = platform_get_resource_byname(pdev, IORESOURCE_MEM, "nicpm_base");
224 	if (regs) {
225 		bgmac->plat.nicpm_base = devm_ioremap_resource(&pdev->dev,
226 							       regs);
227 		if (IS_ERR(bgmac->plat.nicpm_base))
228 			return PTR_ERR(bgmac->plat.nicpm_base);
229 	}
230 
231 	bgmac->read = platform_bgmac_read;
232 	bgmac->write = platform_bgmac_write;
233 	bgmac->idm_read = platform_bgmac_idm_read;
234 	bgmac->idm_write = platform_bgmac_idm_write;
235 	bgmac->clk_enabled = platform_bgmac_clk_enabled;
236 	bgmac->clk_enable = platform_bgmac_clk_enable;
237 	bgmac->cco_ctl_maskset = platform_bgmac_cco_ctl_maskset;
238 	bgmac->get_bus_clock = platform_bgmac_get_bus_clock;
239 	bgmac->cmn_maskset32 = platform_bgmac_cmn_maskset32;
240 	if (of_parse_phandle(np, "phy-handle", 0)) {
241 		bgmac->phy_connect = platform_phy_connect;
242 	} else {
243 		bgmac->phy_connect = bgmac_phy_connect_direct;
244 		bgmac->feature_flags |= BGMAC_FEAT_FORCE_SPEED_2500;
245 	}
246 
247 	return bgmac_enet_probe(bgmac);
248 }
249 
250 static int bgmac_remove(struct platform_device *pdev)
251 {
252 	struct bgmac *bgmac = platform_get_drvdata(pdev);
253 
254 	bgmac_enet_remove(bgmac);
255 
256 	return 0;
257 }
258 
259 #ifdef CONFIG_PM
260 static int bgmac_suspend(struct device *dev)
261 {
262 	struct bgmac *bgmac = dev_get_drvdata(dev);
263 
264 	return bgmac_enet_suspend(bgmac);
265 }
266 
267 static int bgmac_resume(struct device *dev)
268 {
269 	struct bgmac *bgmac = dev_get_drvdata(dev);
270 
271 	return bgmac_enet_resume(bgmac);
272 }
273 
274 static const struct dev_pm_ops bgmac_pm_ops = {
275 	.suspend = bgmac_suspend,
276 	.resume = bgmac_resume
277 };
278 
279 #define BGMAC_PM_OPS (&bgmac_pm_ops)
280 #else
281 #define BGMAC_PM_OPS NULL
282 #endif /* CONFIG_PM */
283 
284 static const struct of_device_id bgmac_of_enet_match[] = {
285 	{.compatible = "brcm,amac",},
286 	{.compatible = "brcm,nsp-amac",},
287 	{.compatible = "brcm,ns2-amac",},
288 	{},
289 };
290 
291 MODULE_DEVICE_TABLE(of, bgmac_of_enet_match);
292 
293 static struct platform_driver bgmac_enet_driver = {
294 	.driver = {
295 		.name  = "bgmac-enet",
296 		.of_match_table = bgmac_of_enet_match,
297 		.pm = BGMAC_PM_OPS
298 	},
299 	.probe = bgmac_probe,
300 	.remove = bgmac_remove,
301 };
302 
303 module_platform_driver(bgmac_enet_driver);
304 MODULE_LICENSE("GPL");
305